A 12.42μA 0.192ppm/°C high PSRR curvature-compensated CMOS bandgap voltage reference

Abstract

A high order curvature-compensated CMOS bandgap voltage reference(BGR) is presented in TSMC 0.35μm CMOS technology with low power low temperature-coefficient(TC) and high power supply rejection ratio(PSRR). The design is used in low dropout regulators which is applied in implanted chips. TC is compensated by adjusting resistor ratio which have different temperature characteristics. A PSRR enhance circuit is inserted in this circuit to maintain a constant gate-source voltage in the current mirror. A TC is 0.192ppm/°C at 3.3V supply and a line regulation is 4.5ppm/V at room temperature. The circuit has a constant voltage of 1.14 V. The circuit performs a PSRR property of 106dB@1kHz and 46dB@1MHz. The circuit consumes a maximum supply current of 12.42μA and start-up time is 2.04μs.